Northrop just won the UAV competition for the Broad Area Maritime Surveillance (BAMS). Basically these are special Predator aircraft with unique sensor packages and performance capabilities, they will work closely with the new P-8. Current outlook is to have 50 BAMS working with the 100+ P-8 ASW aircraft.

The two fleets will focus on different missions. The P-8A will continue the P-3C’s primary focus on anti-submarine warfare, while the BAMS fleet will focus on surface and overland surveillance across a wide swath of territory.
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....each responsible for maintaining a persistent surveillance vigil over a 2,000nm radius.

.... the BAMS aircraft also will be tasked to dive to low-altitude, requiring a new level of high- and low-altitude agility for a UAS fleet.